Changes the radius to use when drawing rounded corners for the group.
- iOS 8.2+
- watchOS 2.0+
The radius (in points) of the circle used to round the corners of the groups edges.
Setting the radius to a value greater than
0 causes the group to draw rounded corners on its background. When a corner radius is applied, the group’s background color or image are clipped accordingly.
The default corner radius for groups is 6 points.